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TLS Online TPP Program

#Question id: 5566

In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males. Why do you think sperm are necessary for reproduction?

#XL - T Zoology

  1. The sperm allow morphogenesis to proceed.

  2. Sperm trigger egg activation.

  3. Cell differentiation is initiated by the sperm.

  4. Sperm are necessary to produce a diploid zygote.

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TLS Online TPP Program

#Question id: 362

#XL - S Microbiology

A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?
TLS Online TPP Program

#Question id: 362

#XL - Q Biochemistry

A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?
TLS Online TPP Program

#Question id: 363

#XL - S Microbiology

What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? If 1.0 mL of 10.0 M NaOH is added to a liter of the buffer prepared, how much will the pH change? (pKa = 6.86)
TLS Online TPP Program

#Question id: 363

#XL - Q Biochemistry

What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? If 1.0 mL of 10.0 M NaOH is added to a liter of the buffer prepared, how much will the pH change? (pKa = 6.86)
TLS Online TPP Program

#Question id: 364

#XL - S Microbiology

 A solution contains 0.0000001 (10-7) moles of hydrogen ions [H+] per liter. Which of the following best describes this solution?
TLS Online TPP Program

#Question id: 364

#XL - Q Biochemistry

 A solution contains 0.0000001 (10-7) moles of hydrogen ions [H+] per liter. Which of the following best describes this solution?